Physics Chap 8 review

The diagram below represents two satellites of equal mass, A and B, in circular orbits around a planet. Compared to the magnitude of the gravitational force of attraction between satellite A and the planet, the magnitude of the gravitational force of attraction between satellite B and the planet is

• twice as great

• half as great

• four times as great

• one fourth as great

The gravitational force of attraction between two objects would be increased by

• a)doubling the mass of both objects and doubling the distance between the objects

• b)doubling the mass of one object and doubling the distance between the objects

• c)doubling the mass of both objects, only

• d)doubling the distance between the objects, only

The radius of Mars is approximately one-half the radius of Earth, and the mass of Mars is approximately one-tenth the mass of Earth. Compared to the acceleration due to gravity on the surface of Earth, the acceleration due to gravity on the surface of Mars is

• smaller

• can't be determined

• larger

• the same

A satellite weighs 200 newtons on the surface of Earth. What is its weight at a distance of one Earth radius above the surface of Earth?

• 100 N

• 800N

• 400N

• 50N

The centers of two 15.0-kilogram spheres are separated by 3.00 meters. The magnitude of the gravitational force between the two spheres is approximately

• a)1.11 x 10-10 N

• b)1.67 x 10-9 N

• c)3.34 x 10-10 N

• d)5.00 x 10-9 N

The chart below gives the mass and orbital period of each of four satellites, A, B, C, and D, orbiting Earth in circular paths. Which satellite is closest to Earth?

• A

• B

• C

• D

The diagram shows a student seated on a rotating circular platform, holding a 2.0-kilogram block with a spring scale. The block is 1.2 meters from the center of the platform. The block has a constant speed of 8.0 meters per second. [Frictional forces on the block are negligible.] Which statement best describes the block's movement as the platform rotates?

• a)Its velocity is directed tangent to the circular path, with an outward acceleration.

• b)Its velocity is directed perpendicular to the circular path, with an outward acceleration.

• c)Its velocity is directed tangent to the circular path, with an inward acceleration.

• d)Its velocity is directed perpendicular to the circular path, with an inward acceleration

Base your answer on the following information. The diagram shows a 5.0-kilogram cart traveling clockwise in a horizontal circle of radius 2.0 meters at a constant speed of 4.0 m/s. At the position shown, the centripetal acceleration of the cart is directed toward point

• R

• S

• P

• Q

What would occur as a result of the frictional drag of the atmosphere on an artificial satellite orbiting the Earth?

• a)The satellite would increase in speed and escape the gravitational field of the Earth.

• b) The satellite would increase in speed and spiral toward the Earth.

• c) The satellite would decrease in speed and escape the gravitational field of the Earth.

• d) The satellite would decrease in speed and spiral toward the Earth.

An athlete in a hammer-throw event swings a 7.0-kg hammer in a horizontal circle at a constant speed of 12 m/s. What is the magnitude of the centripetal acceleration of the hammer?

• 24 m/s^2

• 500 m/s^2

• 6 m/s^2

• 72 m/s^2